Data transcribing machine



May 7, 1940- L. s. HARRISON ET AL DATA TRANSCRIBING MACHINE Filed March 30, 1937 12 Sheets-Sheet 1 FIG].

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DATA TRANSCRIBING MACHINE Filed March so, 1957 12 Sheets-Sheet 5 ATTORNEY May 7, 1940.

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DATA TRANSCRIBING MACHINE.

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DATA TRANSCRIBING MACHINE Filed March 30, 1937 12 Sheets-Sheet 11 A ATTORNEY I $8: m 1 ME. 5.

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DATA 'rnmschmme mcnmfi Filed March 30, 1937 -12 Sheets-Sheet 12 MGR-5 Al'TORNEY Patented 7, 1

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DATA TRANSCBIBING MACHINE Application March 30,

30 Claims.

previously known for automatically transcribing data from a source, such as a perforated tape.

More specifically, an object is to provide means for eii'ecting variable selections of matter to be automatically transcribed.

Another object is to provide a plurality of sources of information to be transcribed, with means for operating the transcribing apparatus under control of information variably selected from any of the sources.

Stillanother object is to provide an improved means for sensing coded data on a record sheet for controlling the transcribing apparatus.

It is also an object to provide means for selecting information to be transcribed from one record sheet while transcribing information from another record. 1

It is a further object to provide means for selecting a record form, under control of its own form identifying designation, for controlling operation of the transcribing apparatus.

Another object also is to move a record tape to a. predetermined position after a certain number 5 of record forms on the tape have been trapscribed.

Other objects will appear from the following parts of the specification, and from the drawings, in which:

Fig. 1 is a plan view of the composite typewriter and robot machine.

Fig. 2 is a front view of the composite machine.

Fig. 3 is a plan view of the robot with the housing removed.

Fig. 4 is a section on lines 4-4 of Fig. 3.

Fig. 5 is a detail of the outer, releasable support and center bearing for a data tape spool.

Fig. 6 is a section on lines 6-5 of Fig. 3.

Fig. 6a is a detail of a circuit breaker lever.

Figs. 7 and 8 are sections along lines 1-l and 8-8, respectively, of Fig. 3.

Fig. 9 is a detail plan view of a switch for sensing depletion of the designation-punched portion of the tape with respect to a tape spool,

1937, Serial No. 133,762

(Cl. 19'l20) Fig. 10 is a. section through a spool-drive assembly.

Fig. 11 is a section on lines ll-|l of Fig. 3.

Fig. 12 isa section on lines l2-l2 of Fig. 3.

Fig. 13 is an end, sectional, view of a para- 5 graph selecting dial.

Fig.1 14 is a sectional side view of the typewriter unit of the machine.

Fig. 15 shows a data tape and the code designations punched in the tape.

Fig. 16a is a part of the circuit diagram.

Fig. 16b is a continuation of Fig. 16a, and

Fig. 16c shows the remainder of the circuit diagram.

Plan of operation The machine comprises a. typewriter and a robot for controlling operation of the typewriter. The robot has means for reading or sensing coded designations punched into a pair of parallel tapes to control operation of the typewriter in accordance with these designations. Only one of the tapes at a time is operative to control the typewriter. Each tape has punched therein the data for a. plurality of paragraphs. The robot includes four paragraph selecting dials, which are set in accordance with the paragraphs to be typed by the typewriter. Under control of thedials, paragraphs are selected alternately from the two data tapes and alternately read out to cause the typewriter to type the paragraphs. While one paragraph on a tape is being read out into the typewriter, the next paragraph on the other tape is being brought to control position. A maximum of four paragraphs, two from each 35 tape, may thus be selected for each letter to be typed.

The ma tapes Fig. 15 shows a section of a data tape and the code used to designate and control different functions of the typewriter and robot. The tape is of dielectric material such as paper. Each coded designation occupies one column extending across the width of the tape. Each designation in a column represents a single letter, mark, or function. The minimum distance between'successive data designations is the distance between successive columns. The tape feeds lengthwise and the distance between successive code designations and the rate of the feed of the tape determine the amount of time provided for the function designated by the perforations in a coliunn to be performed. Certain functions of the typewriter, such as the carriage return, case shift, tabular spacings, and the like, take longer times than the ordinary type bar operation. Accordingly, between the code designation of functions such as carriage return, tabular space, and so on, and the next designation punching, a greater blank distance is provided on the tape than the minimum distance between successive columns. This provides a longer time for the typewriter to perform the function designated by the first code designation before the next designation reaches controlling position. Similarly, to give the robot also a longer time to perform certain functions, a sufliciently larger blank tape portion is provided between the controlling designation and the next designation. Further, certain designations as the paragraph codes may be punched across more than one column and may occupy the width of two or more columns, correspondingly giving a longer time for the paragraph code designation to control certain operations.

The minimum distance between successive designations is the distance between successive tape columns. Any other and larger distance between successive designations is an exact multiple of the minimum distance in order that the timing of certain read-out circuits may be correctly synchronized with the arrival of the designations at the reading or controlling position.

Each tape column has ten possible perforationreceiving or index positions which may be referred to as the 1 to 10 positions for receiving perforations 1 to 10. Between positions 4 and 5, the tape is provided along its length with spaced feed holes 35.

Perforation positions 1, 2, and 3 may be referred to as zone positions while perforation positions 4 to 10 may be referred to as interzone perforations. The coded designations may be considered as divided into eight zones, as follows: The 1 zone in which a perforation in the one position is accompanied by a perforation in an interzone position; the 2 zone having a common 2 position perforation plus an interzone perforation; the 3 zone having a common 3 perforation plus an interzone perforation; the 1-2 zone in which the 1 and 2 positions and one of the interzone perforations are punched; the 13 zone characterized by 1 and 3 and interzone punchings; the 2-3 zone in which the 2 and 3 positions and an interzone position are perforated; the blank zone having no zone perforations and characterized by a single perforation in one of the interzone positions, designations 3 to 9 being in this zone; and the paragraph zone characterized by two hole combinations of the 4 to 10 positions.

Two tapes, such as shown in Fig. 15 are provided. One tape will be referred to as tape T-a and the other as tape Tb.

A typical tape paragraph code punching is as follows: I The first designation of a paragraph is a paragraph code designation. Following at a multiple column distance from the paragraph code designation is a start read designation. After this, the tape is punched with a carriage return turn designation, thereby causing the typewriter carriage to return to the beginning of the line. After the carriage return code, the last designation code of the paragraph is an "end of paragraph code which initiates the reading of the next selected paragraph punched in the other tape, in a manner which will be explained later.

In the present instance, each tape has twenty paragraphs 1 to 20 designated by their corresponding paragraph code designations. These paragraphs are disposed in succession in the order of the paragraph numbers, that is paragraph 1 is followed by paragraph 2, followed by paragraph 3 and so on. Obviously, the paragraphs may be varied in length in accordance" with the amount of data and the number of lines of designations representing the data of the different paragraphs, and each paragraph of a tape may be referred to as a record form.

The typfiwriter The typewriter is preferably of the power type, the principles of which are disclosed in Patents 1,777,055 and 1,873,512. Briefly, referring to Fig. 14, depression of a character key 36 releases a latch 31 'from a cam 38 permitting a springpressed lever 39 to move the cam against a continuously rotating motor-driven shaft 40. The cam is rotated by frictional contact with the shaft in a direction to cause the rocking of the cam carrier 4! to depress a link 42. Depression of link 42 rocks a linkage 43 to propel the type bar 44 towards the platen P, causing the type on the type bar to print on the sheet positioned on the platen P.

The space bar SP operates through similar cam means and the power shaft 40 to cause operation of the carriage escapement to effect letter spacing of carriage C.

The carriage return key CR (Fig. 1) operates carriage return means such as disclosed in Patent No. 1,955,614.

The tabular mechanism operated by a tab key TAB (Fig. 1) is of the type disclosed in Patent No. 1,935,436.

As is well-known, the ordinary hold-down shift key SH (Fig. 1) is depressed to cause a capital case shift of the type and must continue to be held down to maintain the type in capital case position.

For each of the character keys 36, the space bar SP, the carriage return key CR, the TAB key, the shift key SH, and for any other typewriter key to be operated automatically, as well as manually, a solenoid 45, such as shown in Fig. 14 connected to the space bar SP, is provided. Solenoid 45 when energized depresses its associated key or bar to effect the same operation as when the key is manually depressed.

For convenience, the solenoids 45 may be distinguished from each other by appending the character corresponding to the element operated thereby to the common reference character 45. Thus, the solenoid for operating the n key 36 may be referred to as 5-4:, the solenoid for operating the carriage return key may be referred to as 45-CR, and so on.

Solenoids 45 are selectively energized under control of the data punchings or designations of tapes T-a and T-b, in a manner which will be explained hereinafter.

Robot The robot comprises the means for reading out the designations punched in the tapes into equivalent functions of the typewriter. As particularly indicated in Figs. 1, 3, and 8, the robot has two parallel tape sections or units A and B separated by a central drive section. The tape units A and B respectively contain the tapes Ta and T--b and the means for analyzing the tapes, while the central section contains means for driving the parts of the tape units for feeding the tapes. The main parts of tape units A and B may be distinguished by appending letters a and b to the reference characters of these parts.

Base 50 of the robot carries parallel standards Ia, 52a, 53, 54, 55b, and 56b. The central standards 53 and 54 are bridged near their ends by cross pieces or blocks 51 and 58 (see Figs. 3, 7, and 8) having bearings for journaling a main shaft 60. At one end, shaft 00 carries a pulley 6| connected-by a belt 82 to a pulley 63 ha a shaft 64 driven by a motor M rigidly hung from the base. During operation of motor M, shaft 90 will be continuously rotated.

Main shaft 60 carries at the rear end a spiral gear 65 meshed with a spiral gear 96 on a shaft 68, shaft 60 carries-a worm 1| meshed with a worm wheel 12 on a shaft 13 also joumaledin bearings carried by the central standards and parallel to shafts 61 and '10. Spiral gear pairs 65, 66 and 68, 69 have the same gear ratio but their teeth run in opposite directions so that shafts 61 and 10 are rotated at the same speed but in opposite directions by rotation of the main shaft 00 in one direction. Worm II coacts with worm wheel 12 to drive shaft." at about one-eighth the speed of shafts 61 and 10 and in the same direction as shaft 10, or in a direction opposite to that of shaft 61.

Rear shaft 61 operates, through selective clutch connections, to drive the tapes Ta and T-b towards the rear of the robot (as viewed in Fig. 3) during the finding of a. selected paragraph code, and may be referred to as the find shaft. Front shaft 10 operates, through selective clutch connections, to rewind the tapes, causing movement of the tapes towards the front of the robot (as viewed in Fig. 3) and may be referred to as the rewind shaft. Intermediate shaft 13, through clutch and gear connections, feeds the tapes towards the rear, in the same direction as when fed by the finder shaft, but at a much slower rate, during the reading out of data into equivalent typewriter functions, and may be referred to as the read shaft.

At opposite ends of each of shafts 91, I0, and 13 are fixed similar ratchet-toothed driving clutch disks. A detailed description of one such driving clutch disk on the read shaft I3 will suflice to explain all these disks. Referring to Fig. 11, shaft 13 at opposite ends rigidly carries the hubs 15 of spur gears 16a and 16b. Rigidly fixed to gears 16a and 16b are driving clutch disks 11a and 11b. Clutch disks 11a and 11b are rigid with hub collars 18 in the interior of which are set ball bearings for journaling the reduced ends of shafts 19a. and 19b which rigidly carry, through insulation, contact rolls a. and 80b.

Similarly, find shaft 61, at opposite ends, rigidly carries the hubs of driving clutch disks 82a and 82b (Fig. 3), the hub collars of which journal the reduced ends'of rear spool-drive shafts 83a and 00b, and rewind shaft I0 directly carries driving clutch disks 94a and 84b (see Figs. 3, 6, 8, and 10) the hub collars of. which journal front spool-drive shafts 80a. and 85b.

Each of contact roll-carrying shafts 19a, 19b, and spool-drive shafts 83a, 83b, 85a, and 85b rigidly carries a ratchet-toothed driven clutch disk for cooperating with the driving clutch disk the hub collar of which journals an end of the shaft. The driven clutch disks are of similar construction and a detail description of the one, No, on shaft 19a. will suflice for all. Referring to Fig. 11, shaft 19a, at the end adjacent reader shaft 13, rigidly carries a flanged collar 81, the flange 09 of which is provided with pins 89 freely passing through holes in the base of driven clutch disk 06a. The driven clutch disk freely surrounds the neck of collar 81 at the right side (Fig. 11) of the collar flange 88 and may move axially along the neck, guided by pins 89, which also prevent the driven clutch disk from rotating .relative to its carrying shaft. Between a retainer ring 90 fixed to the end of the collar 81 and the clutch disk is disposed a spring washer 93- for urging the driven clutch disk 86a away from the companion driving clutch disk 11a.

In a similar manner, shaft 19b carries driven clutch disk 08b facing driving disk 11b on read shaft 19; rear spool-drive shafts 83a and 83b, respectively, carry driven clutch disks 94a and 901) (Fig. 3) facing driving disks 02a and 8217 on finder shaft 61, and front spool-drive shafts 85aand 05b carry driven clutch disks 95a and 95b (Figs. 3, 8, and 10) facing driving clutch disks 84a and 84b on rewind shaft 10.

Read-shaft 13, as described above, acts through clutch connections to rotate shafts 19a and 19b of contact rolls 80a. and 80b during the data reading operation. In addition to operating shafts 19a and 19b, the read shaft also acts through a friction or slip clutch and=through a releasable toothed-clutch to rotate the rear spool-drive shafts 83a and 83b. The latter, it will be recalled, may also be driven, through clutch connections 82a-94a and 82b-94b, from find shaft 61. During the data reading operation, the clutch connections between the finder shaft and the rear spool-drive shafts are out of action, and

the latter spool-drive shafts are driven by the read shaft 13. The driving connections between the read shaft and the rear spool-drive shafts 93a and 03b include gears 16a and 1612. Gears 18a and 16b respectively-mesh with gears 96a and 9611 (see Figs. 3, 7, 11, and 12).

Referring principally to Fig. 12, gear 960. is rotatably carried by a sleeve 91 freely surrounding a rod 90 mounted onand bridging standards 52a and 53. Gear 96a is engaged at opposite sides with friction rings 99 keyed to sleeve 91. One of the friction ringsabuts a flange I00 of sleeve 91. The other friction ring abuts a disk I02 keyed to the sleeve. Fixed to the sleeve is a spacer I03 between which and the disk I02 is a spring washer I04. The tendency of the spring washer is to force disk I02 toward the abutting friction ring 99 which in turn presses against the adjacent side of gear 96a, the opposite side of which presses against the other friction ring 99, which presses against the flange I00 integral with sleeve 91. Thus, elements 99, I00, I02, I03, and I04 constitute friction or slip clutch connections between gear 96a and sleeve 91, permitting the gear to be positively driven by gear 16a while allowing the sleeve to slip and remain stationary.

To the end of the sleeve adjacent flange I00 is secured a ratchet-toothed driving clutch disk I05a.

Facing disk I050. is a companion driven clutch disk I050. mounted for rotation with a sleeve I01 freely surrounding rod 90. Fixed to sleeve I01 is a gear I09 which through an idler gear I09 (see Fig. 7) drives a gear IIO on spool-drive shaft 930. (also see Fig. 3). The gear transmission between shaft 03a and read shaft 13 is such as to cause shaft 831: to be driven by the read shaft in a direction opposite to the read shaft and at more than twice the speed of the latter. Thus, spooldrive shaft 930. is driven by read shaft 13 in the same direction as the spool drive shaft is driven, through clutch connections, by finder shaft 51. The latter, as previously explained rotates about eight times as fast as the read shaft. Spool drive-shaft 83a is rotated by the read shaft at more than twice the speed of the latter. Thus. when the spool-drive shaft 830. is driven by finder shaft 61, it rotates about four times as fast as when driven by the read shaft 13.

Similarly, read shaft 13, through gear 16b, ro tates gear 96b, which frictionally rotates the drive clutch disk N51) for cooperating with driven clutch disk I06b (Fig. 3) which through gearing I08, I09, 0 rotates spool-drive shaft 83b.

Rear spool-drive shafts 83aand 33b and front spool-drive shafts a. and 85b have similar yieldable drive connections to the spools which carry the tapes A and B. Referring principally to Figs. 3, 6, and 10, the yieldable drive connection comprises a collar II2 fixed to the spool-drive shaft and an end retainer flange II3 past which the reduced end of the spool drive shaft extends. Embracing collar H2 and fixed thereto and t0 the spool-drive shaft is the hub II4 of a doublearm drive member II5. Between flange H3 and the side of hub H4 and rotatably carried by a portion of collar I I2 is a driven member I I0. The latter is provided with a pair of diametrically opposite pins H1 and H8 extending transversely past the plane of drive member H5. The drive member has a pair of shorter pins II9 extending towards the driven member H5 Between one of the pins I I9 and pin I I1 is connected a coil spring I20 and a similar spring connects the other pin II9 to the pin 3. These springs yieldably urge the driven member He to follow the drive member II5 when the latter is rotated counterclockwise (Fig. 6) by front spool drive shaft 35a, and to hold pin II1 against a shoulder I2I ,of the drive plate. Should the driven plate I I3 be restrained from freely and immediately followin the drive plate III, springs I20 will yield permitting the drive plate to move ahead until a shoulder I22 thereon, diametrically opposite shoulder I2I, abuts the pin I I8 of the driven plate. Thus, when the spool-drive shaft is set in motion. springs I20 yield to prevent abrupt pick-up of the driven plate H6. The driven plate is directly connected to the tape spool, as will be shortly explained, and the main purpose of preventin sudden, unyielding movement of the driven plate is to prevent a sudden jerk on the tape when the spool starts its movement.

There are four spools I25 of duplicate construction, two for each of tapes T-a and T-b. For convenience, the rear spools (as viewed in Fig. 3) may be referred to as spools I25-r and the front spools as I25-f. Each spool comprises a cylinder I20 (see Fig. 6) having suitable provisions for detachably securing one end of a tape.

Secured to the cylinder ends are side flanges I21 having center openings, one to freely receive the end of the spool-drive shaft projecting past the retainer flange III (see Figs. 6 and 10), and the other to receive the reduced, round, portion I23 of the cage I29 mounted through ball bearings on the inner end of a rod I30 (see Figs. 3, 4, 5, and 8) There is one rod I30 alined with each spooldrive shaft and combining with the latter to journal one spool I25. Each rod I30 is slidably and rotatably carried by one of the end standards 5Ia and 55b. Externally of the end standard, rod I30 carries a knurled knob I3I for manipulating the rod. The rod is recessed adjacent the ball-bearing end. .to accommodate the forked upper end of a plate spring I32 secured at the lower end to the end standard. Spring I32 urges the rod I30 towards the alined spool-drive shaft. The driven plate member IIO on the spool-drive shaft has an off-center drive stud I33 (see Figs. 3, 6, 8, and 10) adapted to fit into any of the holes I34 formed in a circular row about the center of either spool flange I21.

To insert a spool I25 in place, rod I30 is retracted against resistance of spring I32, permitting the spool to be moved freely into the space between the spool-centering end of the spooldrive shaft and the reduced end I28 of ball-bearing cage I29 mounted on rod I30. The center hole of the spool flange I21 adjacent the spooldrive shaft is then slipped onto the reduced end of the latter shaft and at the same time, one of the off-center holes I34 of the flange is slipped onto the off-center drive stud I33 of the driven plate IIG. Rod I30 is then released to permit the spring I32 to move the reduced end I28 of the ball-bearing cage I29 into the center hole of the adjacent flange I21 of the spool. The pressure of spring I32 forces the shoulder I35 (Figs. 3 and 5) of the ball cage I29 against the side of the spool flange centered on the reduced end of the cage. This pressure is also transmitted to the opposite spool flange to press the latter against the side of end flange II3 of the collar II2 on the spool-drive shaft, and at the same time tomaintain the spool flange in cooperation with the centering end of the latter shaft and with the drive stud I33 of the driven plate II6. Due to the frictional engagement between the shoulder I35 of ball cage I23 and the side of the spool flange, the ball cage rotates with the spool, thus providing an anti-friction bearing for the outer end of the spool. The other, inner end of the spool rotates with the driven plate I I5.

In above manner, each of the four spools I25 is mounted for rotation with the driven plate II5 of one of the four spool-drive shaft assemblies.

Each spool, when in place, is constantly engaged by a friction brake to prevent unrestrained rotation of the spool when the tape is being unwound therefrom. Each friction brake comprises-a friction block I36 (Figs. 3, 6, and 8) engaged with one of the spool flanges I21. The friction block is fastened to the end of an arm I31 rotatably carried by a shaft I38 and urged transversely towards the spool by a spring I33 surrounding the rod. A spring I40 secured to arm I31 and the frame urges the brake block upwardly to maintain constant engagement with a spool flange I21 when the latter is in position in the machine. When a spool is being inserted in place, the brake block is manually depressed. Failure to do so causes the side of the spool flange to engage the side of the brake block and moves 9,100,541 the latter sidewise against resistance of spring I39, the yielding of the spring preventing inJury to the spool flange or its brake.

The tape extends from one spool over a guide plate I (Figs. 4 and 6) the upper, tape-engaging, face of which extends substantially tangential to the periphery of the contact roll 80, then over the surface of the contact roll, then over another guide plate I, and to the other spool. The guide plates III are secured to standards 5Ia, and 52a and are beveled along their opposite parallel edges to eliminate angular comers from the path of the tape.

During the reading of data from a tape to coning the tape during this reading operation is op-- erated by read shaft I3. As already described, the read shaft is connected through the pairs of clutch elements 85 and 71 to the shafts IQ of the contact rolls 80. Each contact roll has, intermediate its ends, a circular row of radially projecting feed pins I42 (Figs. 4, 6, and 11) which are adapted to enter feed holes 35 of the data tape to positively feed the tape during rotation of the contact roll by the read shaft.

When the shaft of contact roll 80a or b is clutched to read shaft iii, the latter rotates the contact roll counterclockwise (as viewed in Figs. 4 and 6), causing feed pins I42 by coaction with tape holes 35 to feed the tape in the reading direction, to the left. As the tape moves to the left, it unwinds from its front spool I25f, rotating the latter against the frictional restraint of the brake element I36 engaged with a spool flange I21. Due to the resistance of the spool to free rotation, the tape between the contact roll and the spool tends to move ahead of the spool and to thereby remain taut. At the same time as the tape is unwinding from the front spool, it must be wound on the rear spool I25-r. Accordingly, during the feeding of the tape by the contact roll pins I42, the rear spool must be rotated clockwise (Figs. 4 and 6). This is done through the previously explained clutch and slip transmission between the rear spool drive shaft 83a or b and the read shaft I3. The transmission, for instance, between read shaft l3 and the spooldrive shaft 83a of the rear spool of the unit A section comprises gear lid on the read shaft, gear 960. meshed therewith, friction or slip clutch elements 99, I00, I02, I03, and I04 between gear 96a and sleeve 9! (see Fig. 12), the driving clutch disk I051; rigid with the sleeve hub, the driven clutch disk IIlGa, gear I08 rotatable with the driven disk, idler gear Int and gear IIII (Fig. '7) on spool drive shaft 33a.

As previously explained, the spool-drive shaft 83a is driven, by the above transmission, at more than twice the speed of read shaft I3. The diameter of the cylinder I26 of a spool I25 is substantially the same as the diameter of a contact roll 80. Thus, with the rear spool being driven at more than twice the speed of the contact roll, the rate of feed of the tape by pins I42 of the contact roll is less than the minimum rate at which the rear spool tends to wind upthe tape. As a result, the tape portion extending between the contact roll and the rear spool is constantly maintained taut during the feed of the tape during data-reading operation. When the tape is sufficiently taut, it restrains rotation of the rear spool, this being permitted by the friction or slip drive connections in the transmission between read shaft I3 and the rear spool. Thus,- the rear spool is permitted to wind up the tape during the reading operation at a rate governed only by the rotation of the contact roll and in such a way that the tape portion passing over the contact roll is maintained constantly taut.

.During the paragraph find operation, when a selected paragraph on the tape is being sought, the find shaft 81 is clutched to the rear spooldrive shaft and positively rotates the rear spool in the same direction as when impositlvely driven by read shaft I3. At this time, the contact roll is declutched from read shaft 13 and the front spool-drive shaft is declutched from rewind shaft III. With the rear spool drive shaft clutched to the find shaft 51, the rear spool will be positively rotated clockwise (Figs. 4 and 6) at four times the speed at which it is driven from the read shaft I3. As the rear spool rotates clockwise, it winds 'up the tape, feeding it to the left (Figs. 4 and 6) or in the reading direction. As the contact roll is free to rotate, the tape, while being wound on the rear spool, rotates the contact roll by coaction of tape holes 35 with pins I42 of the contact roll. Also, the tape unwinds from the front spool, just as during the reading operation.

During the reading operation, the rate of feed of the tape is governed by rotation of the contact roll by read shaft 13, while during the finding operation, the rate of feed of the tape is governed by rotation of the rear spool through driving connection to find shaft 61. As previously explained, rotation of the read shaft is at about one-eighth the speed of rotation of the finder shaft. Thus, the tape is moved at least eight times as fast during the finding operation as during the data reading operation. Further, as the size of the tape roll on the rear spool increases, the speed at which the tape is wound thereon during operation of the find shaft increases.

When the front spool drive shafts 15a and b are clutched to rewind shaft 10, then the contact rolls are not clutched to read shaft I3, and the rear spool drive shafts 83a and b are not driven by either the read shaft or the find shaft. Thus, during the rewind operation, only the front spools I25-f are positively driven. The driving of the front spools is in a counterclockwise direction (Figs. 4 and 6), causing movement of the tape to the right or in a rewindor reverse direction.- During movement of the tape to the right, tape holes 35 coact with contact roll pins I42 to rotate the contact roll clockwise, and at the same time the tape unwinds from the rear spool, rotating the latter counterclockwise, against restraint of the friction block I36 engaged with a spool flange I2I. The rate of feed of the tape during rewind operation is dependent upon the speed at which the front spool l25--f is being driven by the rewind shaft I0 and alsoon the diameter of the tape roll wound on the front spool. Since the speed of the rewind shaft is about eight times that of the read shaft, the tape is fed a minimum of eight times as fast during rewind operation as during data reading operation, or at substantially the same rate as during findin operation.

Underlying each spool is a bail rod I43 (see Figs. 3, 6, and 8) rotatably carrying rubber rollers I44. The bail rod is carried by arms I45 fast to shaft I38. On this shaft is also fast a bell crank I45, of which the lower, vertical arm is tape roll with rollers I44 keeps the bail rod I48 connected to a coil spring I 41 and of which the horizontal arm rigidly carries an insulating plate I48 overlying the end of a lower spring contact blade I49 provided with one of the contact points PC the companion point of which is on a spring blade I5I (also see Figs. 4 and 9). The spring I41 tends to rock shaft I38 in a direction to move the insulating plate I48 down against the end of spring blade I49, to thereby open contacts PC. This action is normally prevented by engagement of the tape roll on a spool with the rubber rollers I44 engaged therewith. The engagement of the in a lowered position, maintaining the insulating piece I48 free of contact blade I48. When the diameter of the roll of tape on a spool falls below a prescribed minimum, shaft I38 is permitted to rock under the influence of spring I41 in a direction to cause opening of contacts PC associated with the spool. The minimum tape roll diameter is normally reached when the data or designation-punched portion of the tape has been unwound from the roll. Each pair of contacts PC may be referred to as a paper roll switch and distinguished in accordance with the spool under which its control bail lies. Thus, the paper switch for sensing depletion of the designation portion of the tape roll on the front spool I25-f of unit A may be characterized in the circuit diagram as PC-f (Unit A), one controlled by the roll on rear spool I25f may be distinguished as PC-r (Unit A) and similarly for unit B.

To clutch the shafts 61, 10, and 13 to the shafts driven thereby, the driven clutch disks are moved towards the companion driving clutch disks under control of solenoids. The clutchcoupling means for each shaft will now be described.

The driven clutch disk 95a of front spool-,drive shaft 85a is moved into engagement withdriving clutch disk 84a of rewind shaft ,10 under control of a solenoid 152a (Figs. 3 and 6). Energization of solenoid I52a attracts its plunger, I83 which acts through a link- I54, to rock a, bell crank I58 clockwise (Fig. 6) against resistance of a restoring-spring I58. The free endof the bell crank rotatably carries a disk I81 having abeveled edge underlying the rounded, rear, peripheral edge of the driven clutch disk 9511 (also see Fig. 8). When energization of solenoid I52a causes rocking of bell crank I85, disk I 51 rises and its beveled edge cams against the rear, peripheral edge of the driven clutch disk 95a to force the latter towards and into mesh with the driving clutch disk 84a on the rewind shaft 10. As long as solenoid I52a is energized, the driven clutch disk will remain engaged with the driving clutch disk, thereby coupling the front spool-drive shaft 88a to the rewind shaft for rotation by the latter.

Similarly, driven clutch disk 95b is engaged with driving clutch disk 84b on the rewind shaft by operation of a disk I01 upon energization of a solenoid |52b (Figs. 3, 7, and 8).

Through similar means, solenoids I58a and I88b (Figs. 6, 7, and 11) when energized respectively mesh driven clutch disks 84a and 841) with driving clutch disks 82a and 82b on find shaft 81, to couple near spool drive shafts 83a and b to the finder shaft.

A single solenoid I591: (Figs. 3, 6, 7, and 11) is provided to control operation of both driven clutch disks 86a and I06a. Another such solenoid press the beveled disk I88 (Fig. '7) carried by the latter towards the driven clutch disk I081: (Fig. 3), causing the latter to mesh with driving clutch disk Ili8b which is inthe slip clutch transmission between the read shaft 13 and the rear spool shaft 88b. Link I6I is also connected through a second link I84 with a second bell crank I (also see Fig. 11), the beveled disk I66 of which coacts with driven clutch disk 86b. Thus, when solenoid I 88b is energized, its plunger is attracted against resistance of a restoring spring I81 to simultaneously depress beveled disks I63 and I88 to respectively mesh the driven clutch disk "8b with driving clutch disk H151: and the driven clutch disk 88b with the driving clutch disk 11b on the read shaft 13.

Similarly, energization of solenoid I59a causes clutch disks I860. and 88a to mesh respectively with driving clutch disks I08a and 11a.

. It is apparent, then, that upon energization of a solenoid I88, the read shaft 13 is coupled, through a clutch 'I'I--86, to a shaft 19 to rotate the contact roll 88 fixed thereto, while at the same time, the clutch IDS-I68 in the slip drive transmission from the read shaft to the rear spool-drive shaft 68 is rendered eflective.

Two parallel rows of brushes F and R. are provided for each of units A and B to sense the perforations of the data tapes T-a and T-'b (see Figs. 3, 4, 6, 8, and 11). Each row of brushes extends across the width of the contact roller and across the width of the tape passing over the contact roller. One brush or each row is located along the line of travel of one index or perforation receiving position of the tape. There are ten such index positions 1 to 10 (Fig. 15), and, correspondingly, there are ten brushes in each row adapted to sense the ten index positions 1 to 10. For convenience, these ten brushes of a row may be distinguished by appending the numbers of the index positions sensed by them to the common reference character, as indicated in Fig. 11; for instance, brush R-8 (Fig. 11) senses the index points 6 of the tape. An additional brush in each row is provided for sensing the bare surface of the contact roller to act as a common return brush. The latter brush may be distinguished by appending the letter 0 to the general reference character.

Referring to Fig. 8, brushes F are inclined in the reading direction of travel of the tape, from right to left. When placed in engagement with the tape during movement of the latter in the reading direction, the brushes will flex to the movement of the tape and sense the perforations thereof without obstructing the travel of the tape or being injured by the tape. Brushes F, then, are the brushes for sensing the tape during its movement in a reading direction. Brushes R. are inclined oppositely to brushes F to sense the tape during its travel from left to right or in the rewind direction. Brushes R, then, are the brushes for sensing the tape while being rewound.

Each row of brushes is secured to a block I10 of insulating material. The rear ends of each pair of corresponding, alined, brushes F and R. are in constant wiping engagement with the sides of a conductive plate III rigidly set in the apex of an inverted V-molding I12 of dielectric material. These conductive plates I'll form bridging conductors for conductively connecting the brushes F and R which sense the same index positions of the tape and for conductively connecting the two common return brushes F-c and R-c.

Molding I12 is formed with parallel slots I13 (Figs. 3, 6, and 11) through which the brushes F and R extend towards the contact roller. The diverging arms of the V-molding are located at a slight distance above the contact roller and are substantially tangential to the roller. The lower ends of the arms of the molding overlap the upper ends of the guide bars Ill, to act as upper holddown guides for the tape passing over the guide bars. The crotch of the molding is concentric with the periphery of the contact roller to act as an upper guide for the tape passing over the contact roller.

Molding I12 is fastened at opposite ends by screws I14 (Fig. 11) to the parallel sides of an open rectangular casting I15. Each casting is formed with bosses I16, adjacent the central, drive section of the robot, for receiving a hinge pin I11. The casting of unit A is thus hinged on a pin I11 carried by standard 52a (see Figs. 3 and 11) while the casting of unit B is similarly hinged to standard 5517 (also see Fig. 7).

Each casting I15 maybe swung back on its hinge from normal operating position above the contact roll of a unit to an out-of-the-way position above the central section of the robot, thereby fully exposing the contact roll and the tape. The normal operating positions of the castings I15 are indicated in full lines in Fig. 11, which also shows in dotted lines the alternate, idle, outof-the-way position of the casting of unit A. When the casting and the brush assembly carried thereby are in idle position, the operator has full access to the contact roller and tape to permit the tape to be removed from or inserted on the contact roller.

As explained above, casting 115 is supported at the side adjacent the central section by the hinge pin I11. The opposite side of the casting, when in normal position, rests on top of the end standard 5Iw or 58b. To accurately locate the casting, and thereby the brush assembly, when the casting is in operative position, the outer end of the casting is provided with a locating pin I18 (Fig. 11) received in a hole I19 in the end standard.

For releasably retaining casting I15 in its normal, down, position, a plate I is secured to the top of the outer casting side for cooperating with a latch hook I8I pivoted to the outer face of the end standard (see Figs. 3, 4, 8, and 11). A spring I82 connected to the latch hook urges the latter into latching engagement with the plate I80.

As explained thus far, casting I15 rigidly and dependently carries the inverted V molding I12 and brushes F and R are fixed to blocks I10. Each of blocks I10 is fastened to a separate bail bar I85 (Figs. 3, 6, and 8). The two bail arms I86 (Figs, 4 and 8) at opposite ends of bar I85 and bent at right angles to the latter are engaged with pivot studs I81 carried by the sides of casting I15. The bar I85, the block I10, and the sensing brushes carried by the block are thus rockably mounted on the casting I15. One of the bail arms I88 of each bar I85 is formed with an upward extension I88 (Figs. 3, 4, 6, 7, and 8) bent to dispose its upper end contiguous to the side of a link I89 to one end of which it is pivotally connected. The other end of link I89 is connected to the plunger I90 of a solenoid I9I. The upper end of extension I88 is connected to a spring I92 which acts to retract the plunger I90 and at the same time to rock the bail bar I85 in such a direction as to raise the block I10. The brushes carried by the block I10 are then in raised, inactive, or idleposition, at a clear distance above the contact roller, and with their lower portions completely within the slots I19 of the molding I12. The back of extension I88 engages a stop screw I98 (Figs. 4 and 6) to limit the action of spring. I92 and to determine the inactive position of the brushes. When a solenoid I9I is energized, it rocks the bail I85-486 in a direction to lower the brush block I10, moving the lower ends of the brushes towards the contact roller, and into engagement with the tape portion of the contact roller.

Each solenoid I9I controls a different set of brushes F and R. To further distinguish the solenoids, they may be characterized as I9Il and I9I--R., respectively, controlling the forward brushes F and the rewind brushes R of a tape unit. i

Carried by the side of molding I12 adjacent forward reading brushes F is a switch assembly comprising a pair of spring blades I94 and I95 (see Figs. 6 and 8) provided with coacting brush carrier-controlled contacts BCF (also see Fig. 4). The upper blade I98 underlies the insulated tip of a screw I91 carried by a member I98 fastened to the back of the adjacent bail bar I85. Screw I 91. will move with bail bar I85 which rigidly carries the block I10 supporting the set of brushes F. When the brushes F are in raised,

inactive, position, bar I85 will be in lowered position and the insulated tip of screw I91 will engage upper blade I99 to force contacts BCF to close. When the brushes are moved down to active position, bar I85 rises and screw I91 withdraws from blade I94 which springs away from blade I95, permitting contacts BCF to open.

Similarly, a pair of contacts BCR at the rewind brush side of the brush assembly are opened when the brushes R are down in active position and closed when the brushes are in inactive, raised, position.

The shaft 19a of contact roller 80 rigidly carries, adjacent standard 52a, a circuit breaker cam ring 200a (Figs. 3, 6, and 11) of dielectric material formed around its periphery with depressions 20I spaced apart at distances corresponding to that between adjacent designationbearing columns of a data tape. Engaging the circuit breaker ring 200a is a roller 202 (see also Fig. 6a) carried by the lower end of a lever 203, the upper end of which carries a circuit breaker contact point CB-a for cooperating with a stationary companion contact point CBa. A spring strip 205 is fastened at oneend to the robot frame and curled around the pivot of lever 203 to be fastened at the opposite end to the low er arm of the lever. The tendency of spring 205 is to rock lever 203 clockwise to maintain follower roller 202 engaged with the periphery of circuit breaker ring 200a.

When the follower roller 202 is in a depression 20I of the circuit breaker cam 200a, then lever 203 is at its clockwise limit, and contacts CB-a are closed. When a high portion of the breaker cam 200a, separating adjacent depressions 20I, engages roller 202, the lever 203 is rocked counterclockwise, opening contacts CB-a.

Circuit breaker cam 200a rotates with contact roller 80a and successive depressions 20I of the cam are engaged with the roller 202 during the passage of successive columns of the data tape past a row of active brushes. The depressions 20I and the intermediate high points or peaks are so arranged relative to feed pins. I42 of the contact roller, which determine the positions of the tape, as to cause contacts CB-a to make just after a perforation of a tape column reaches an active sensing brush and to break just before the perforation leaves the brushes. Thus, contacts CB-a take the spark off the sensing brushes upon making and breaking of the sensing circuit.

Similarly for the tape unit B, a circuit breaker cam 2011b is provided (Fig. 11) for operating a lever 203 to control the make and break circuit breaker contacts CB-b .(Fig. 3), which time the sensing circuits made by the brushes of unit B when they engage the contact roller 80b through perforations in tape Tb.

A cover 2l0 (Figs. 1, 4, and 6) is removably secured to casting I to protect the brush assembly carried by the casting.

As indicated in Figs. 1 and 2, the robot is preferably carried by a drawer 2| 2 of the desk on which the typewriter unit is placed. The front panel 2l3 of the drawer carries four paragraph selecting dials, characterized as D-l, 2,

3, and 4. Dial D-l selects the first paragraph of the letter from tape Ta, dial D2 selects the second paragraph of the letter from tape Tb, dial D--3 selects the third paragraph of the letter from tape Ta, and dial D-l selects the fourth paragraph of the letter from tape Tb.

The construction of a paragraph selecting dial is indicated in the sectional end view, Fig. 13, and will be further understood from the circuit diagram (Fig. 16c).

Each dial is provided with a front contactcarrying plate or panel 2l5 and a similar back panel 2l5', both of insulating material. Panels 2l5 and H5 respectively carry ten contact studs 2I6 and 2H5, the studs of one panel having the same positions as the studs of the other panel with respect to the dial center. The front of the dial is provided with an indicating plate 2|! having numbers corresponding to the paragraphs which may be selected by the dial. As indicated in Fig. 160, dial Dl may select paragraphs 1 to 10 of tape Ta, dial D-2 may select paragraphs 1 to 10 of tape Tb, dial D3 may select paragraphs 11 to of tape Ta, and dial D-l may select paragraphs 11 to 20 of tape Tb. 1

The shaft 218 of a selecting dial carries a combination knob handle and pointer 2l9 to turn the shaft for selecting a desired paragraph as indicated by the indicating plate 2". Fastened to shaft 218, centrally between the front and back panels 2l5 and U5 is a notched disk 22I of dielectric material which carries, at opposite faces, a front switch blade 220 of spring material and a similar back switch blade 220', each having at one end a nib 222. The nib 222 of the front blade 220 is adapted to engage contacts 216 of the front panel while the similar nib of the back blade 220' is adapted to engage back contacts 2l6'. Each switch blade, at the end opposite its nib 222, has a similar nib 223 for wiping a common contact ring 224 in every position of dial shaft M8. The switch blades 220 and 220, being carried and separated by insulating disk 22l are insulated from each other, so that, in effect, the front blade and contacts wiped thereby constitute a front multipoint switch of a dial electrically distinct from the back blade and contacts wiped thereby, which constitute a back switch of the dial. Being mechanically connected, the front and back switch blades of a dial are commonly adjusted by the turning of shaft 2l8, and in each position of adjustment of the shaft, both the front and back blades respectively enga e corresponding front and back contact studs.

The blades of a dial are impositively retained in any paragraph selecting position by the coaction of ball latches 225 with the notches of the blade-carrying disk 22l. The ball latches are urged towards the disk MI by springs 226.

Circuits and operation The operation of the machine will be made clear in the description of the circuits and with particular reference to the circuit diagrams, Figs.

D--l at 8 13-2 at 4 D-3 at 15 D-4 at 17.

After placing a letter sheet in the typewriter and typing in the date, inside address, and salutation, the operator closes main switch 230 (Fig. 16a) putting power on the and lines. Motor M .of the robot is directly across the and lines and closing of the main switch immediately sets this motor running. Motor M now constantly rotates main shaft 60 of the robot (see Figs. 3, '7, 8 and 11). Motor TM of the typewriter is in series with a toggle switch 23| of the typewriter unit (also see Fig. 1). When this toggle switch is closed by the operator, with switch 230 also closed, motor TM is set running to continuously rotate power shaft 40 of the typewriter (see Fig. 14).

The closing of main switch 230 in addition to setting motor M running, and permitting motor TM to be set in operation, also completes the following circuits (middle of Fig. 16b) Relay coils MCR1.--From the line, through coils MGR-l, normally closed contacts MCR8b, to the line.

Relay coils M CR3.--From the line, through coils MGR-l, normally closed MGR-9c contacts, to the line.

If the tape paragraph to be selected is initially past and to the right (Fig. 6) of the tape-sensing brushes F and R, then the tape should be fed in the reading direction, right to left, to bring the chosen paragraph to control position. chosen paragraph is in advance or to the left of the brushes, then the tape should be fed in the rewind direction, left to right, to bring the paragraph to control position. To take care of all conditions, the tape is first moved in a rewind direction by rewind shaft 10 (Figs. 3, 7, and 8) and the rewind brushes R set in active position. Then if the chosen paragraph is to the left of the brushes R, the paragraph code will be sensed by the rewind brushes R and the tape rewind interrupted. The tape will then be moved ina reading direction by the read shaft 13 to have the selected paragraph data sensed by the forward brushes F for controlling operation of the typewriter. If the chosen paragraph is initially to the right of the brushes R, then the rewind operation will proceed until the tape is fully rewound on its front spool l25.f (Fig. 6). The tape will then be fed in a reading direction by the finder shaft I! (Figs. 3 and 7) and brushes F If the 

